Testing Archival Paper (from 4-202 (part 2)

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Dear Sophia and classmate,

I was watching part two of lesson 4-202 (Quick Fix Preservation Re-back for Deteriorated Leather Book) and I was wondering how I would go about testing if a piece of paper is archival or not? If I don’t know the maker for example, or got it second-hand?

Thank you.

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Carlijn Bakker Posted by (Questions: 14, Answers: 16)
Asked on April 25, 2022 7:40 am
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Good question. When in doubt you will have to assume it is not archival. You can buy a ph testing pen at art supply stores. This sort of pen can tell you the ph of the paper if the paper is of a light enough color. The pen "ruins" whatever you test it on though so best not to text pages in books with it. It is important to get your supplies from trusted sources such as Washi Arts and Talas. 

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Posted by (Questions: 1, Answers: 220)
Answered on April 25, 2022 5:41 pm
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    Thank you yet again. :) I will see where I can buy one of the pens (in Europe).

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    Carlijn Bakker Posted by (Questions: 14, Answers: 16)
    Answered on April 26, 2022 5:40 am